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Alamosaurus is a genus of herbivorous sauropod dinosaur from the late Cretaceous Period. It lived in what is now North America, mainly in what is now the southwestern United States, around 85 million years ago. It is named after the New Mexican village of Alamo in which its remains were discovered. It was the last known sauropod to have lived in North America and the largest known.


Alamosaurus was a large and powerful sauropod dinosaur. It had a long neck, a small head, and a long tail. Its size is estimated to have been around 25-35 meters (82-115 feet) in length and weighed up to 50-70 tons. It had a bulky body with four large, column-like legs, and a long tail. Its neck was thick and muscular and its head somewhat small, but was still capable of shooting streams of water 2 meters (6.5 feet) long.

Its skull was long and narrow, and its jaws were adapted for crunching vegetation. Its teeth were broad and pitted like those of other sauropods, indicating a diet of plants. Its front limbs were relatively short, but its rear limbs much longer, indicating that it was a relatively good walker.

Habitat and Distribution

Alamosaurus lived in what is now North America during the late Cretaceous Period. Its fossils have been found in places such as Texas, New Mexico, Utah, Arizona, and Alberta. It is believed to have roamed the grasslands and woodlands of the area, feeding on plants like ferns and cycads. Its large size and powerful legs probably enabled it to travel long distances, crossing rivers and mountain ranges in search of new sources of food.

Discovery and Naming

The first fossil remains of Alamosaurus were found in 1924, in the San Juan Basin of New Mexico. They were first identified as a new species of sauropod in 1942, but were not described as a new genus until 1975. It was named Alamosaurus sanjuanensis, after the New Mexican village of Alamo in which its remains had been discovered.

Alamosaurus two


Alamosaurus is classified as a Sauropod, a group of large, plant-eating dinosaurs. Within this group, it is part of the Titanosauriforms, a group comprising the heaviest and most robust sauropods of the late Cretaceous. It is the last known sauropod to have existed in North America, and the largest one known.

Behaviour and Ecology

Alamosaurus is believed to have been a relatively peaceful and gentle creature, preferring to browse on low-lying vegetation. It is possible that it travelled in herds, as is typical of sauropods, and that it communicated using low-frequency calls. It probably used its long neck to reach for the upper branches of trees, and its broad, column-like legs to navigate the rough terrain.


Alamosaurus is thought to have gone extinct around 66 mya, which was the same time that an asteroid impact occurred in the Gulf of Mexico. That event is believed to have caused drastic climate changes, resulting in the extinction of many species. It is thought that Alamosaurus was one of the dinosaurs that could not survive the changes in its environment and died out.


Alamosaurus was an impressive and powerful dinosaur, and the largest sauropod known to have roamed North America. It is thought to have been a peaceful and gentle animal, and probably travelled in herds. Despite its size and strength, it was unable to survive the drastic climatic changes that followed the asteroid impact at the end of the Cretaceous, leading to its extinction.

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